Journal
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
Volume 34, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.gete.2023.100452
Keywords
Rock mechanics; Fracture angle; Hoek-Brown criterion; Shear zone
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The fracture angle of Mohr-Coulomb is 45 degrees + φ/2, which is important in soil mechanics. However, the fracture angle of the non-linear Hoek-Brown criterion is not as easily derived. Using physical evidence of no parallel plastic strain in the shear zone, the fracture angle of Hoek-Brown materials is derived as tan-1√1 + m(2√s + mσ3/σc). Experimental and numerical results confirm the agreement between the theoretical and observed fracture angles.
The fracture angle (defined as the angle between the normal vector of the fracture plane and the first principal stress) of Mohr-Coulomb is 45 degrees +& phi;/2, which plays a crucial role in soil mechanics. However, for the non-linear Hoek-Brown criterion, the fracture angle cannot be derived as easily as Mohr- Coulomb. Based on the physical evidence that there is no parallel plastic strain in the shear zone, the fracture angle of Hoek-Brown materials, is derived as tan-1 & RADIC;1 + m(2 & RADIC;s + m & sigma;3/& sigma;c). The experimental data of marble and granite and numerical results demonstrate that the obtained theoretical fracture angles agree well with the experimental and numerical fracture angles. & COPY; 2023 Elsevier Ltd. All rights reserved.
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